Statistics of Galactic Supernova Remnants (continued)

TL;DR

This study analyzes Galactic supernova remnants, revealing how electron temperatures, shock velocities, and swept-up masses evolve with age, and how radio fluxes relate to ISM density, providing statistical insights into their physical properties.

Contribution

It offers a comprehensive statistical analysis of SNRs, highlighting the relationships between their physical parameters and age, and identifying the typical ranges of key properties.

Findings

Electron temperature and shock velocity decrease with age.

Swept-up mass of ISM increases with age.

Radio fluxes slightly increase with ISM electron density.

Abstract

Our statistics on Galactic supernova remnants (SNRs) shows that the electrons temperature ($T$) of hard X-ray and the shock waves traveling velocity ($\upsilon$) decreases with ages ($t$) for all-sort remnants. However, the shock waves swept-up mass ($M_{su}$) of ISM increases with the age. Second, the remnant radio fluxes ($S$) at 1 GHz increase slightly with ISM electrons density ($n_0$). At last, the number distributions illustrate that the supernovae (SNe) initial kinetic energy ($E_0$), hydrogen column density ($N_H$), electrons temperature (kT) of hard X-ray, magnetic field ($B$) and the shock waves swept-up mass ($M_{su}$) of ISM mainly peaked at $(1 \sim 10) \times 10^{50}$ ergs, $(1 \sim 10)\times 10^{21}$ cm$^{-2}$, a few KeV, 100 $\mu$G and 10$\sim$100 $M_{\odot}$, respectively.